Unable to merge androidmanifest.xml in unity with Firebase

The app is working fine before I imported Firebase SDK to my app and used its functionalities.

Here is the error message in my console.

 CommandInvokationFailure: Unable to merge android manifests. 
 E:/AndroidStudio/jre\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="E:/AndroidStudioSDK\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
 
 stderr[
 Error: [tmp36ff6e72.tmp] Failed to write XML file: javax.xml.transform.TransformerException: java.io.FileNotFoundException: C:\Users (Access is denied)
 Error: [C:\Users\#IAMHA~1\AppData\Local\Temp\tmp36ff6e72.tmp] Failed to write manifest file.
 ]
 stdout[
 
 ]
 exit code: 1
 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.BuildPlayerWindow:BuildPlayerAndRun(

After clicking Build and Run, The error pops up saying Unable to merge Android Manifests.